I've just started playind Sea Block and I can't research the technology enabling boiler and steam engine. And instead of its name this is displayed: Unknown key: "technology-name.steam-power"

Why can't you research it? Can you post a screenshot please?

Also, do you have the full mod pack enabled? Install "Sea Block Pack - Official" mod to get the full pack.

False alarm, I can research it after all. Sorry. xD
The name is still weird though.
I didn't install the full modpack, I wanted a little less complexity.
Btw I can't see the option to add screenshots here.

All good. I've been able to reproduce the tech name. I'll have that fixed next version. If you have Bob's Tech or Bob's Power mod enabled then it shows correctly.

https://github.com/modded-factorio/SeaBlock/issues/332

Thank you very much!